Question about Dremel Variable - Speed Multipro Rotary Tool 395

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Worn front bearing on Dremel Multipro

Collett holder appears to be a press fit onto armature shaft, worn bearing is behind holder. How do I remove holder to get to bearing?

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Sorry, here is a link to that picture, full sized.

Grease Monkey 626

Posted on Aug 24, 2009

  • G-monkey 626 Jul 14, 2010

    Here's that image again


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You can put new grease into that bearing without removing it by following the steps in this M.S. Paint drawing I made. After a bit of protest, mine started running a lot better.

Grease Monkey 626 worn front bearing on Dremel Multipro - 01c0409.jpg

Posted on Aug 24, 2009

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To speak to Dremel about bearing call 1-800-437-3635 and also ask to speak with their tech service, this is all I could find

Posted on Dec 24, 2008

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To remove the fan you will need a decent bearing puller - it is press-fit onto the armature shaft and doesn't come off easily.

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You need to place the brushes back into their holders, with the springs compressed. Sometimes paperclips, molded into helpful shapes will aid in facilitating this exercise.
Next, you need to carefully place the armature back into position, taking into account the rear bearing, the brush holders and any other inconvenient structures that impede your progress....PS this is a great time to add grease to the bearings as they are not usually available for maintenance.
Finally, make sure that the commutator surface is clean and free of carbon residue from the brushes. Clean with a non-conductive nylon brush and something akin to brake cleaning fluid.
Before you re-assemble, look to see if there is a washer that is not flat but is "convoluted". This is a thrust washer and belongs in-place in front of the rear bearing. Consequently, it must be placed on the armature shaft before re-inserting it into the motor stator.
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TO Disassemble

Remove the field coil and then pull the field coil with end cap from the solenoid housing, holding the end cap to the field coil to avoid pulling the armature out of the brush holder which would require further starter disassembly. Then with a 9 mm socket, remove the two hex screws with Phillips recesses to release the solenoid housing from the drive housing and if necessary use a dead blow hammer or a rubber mallet to separate the solenoid and the drive housings. And remove the return spring from the solenoid plunger shaft.

TO Re-Assemble

Install the return spring onto the solenoid plunger shaft and then mate the solenoid and drive housings and install the two hex screws using a 9 mm socket and alternately tighten them until they are snug. Then lubricate the armature bearing with LUBRIPLATE 110 grease and seat the armature bearing into the counterbore and mate up the field coil and solenoid housings. Properly assembled a small nub on the field coil housing flange must engage the slot on the solenoid housing flange closest to the short field wire post on the solenoid housing

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I took apart my Dremel 395 Type 3 and the spring popped out for the shaft lock. Where does the spring attach to?

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Dremel 395 Rotary tool won't turn on or won't stay on but a second or two

Electrically speaking there are a few items to check.

1) The easiest is to remove the two brush holders screws on each side by the power cord. If one of the screws are loose, or the bushes are worn you will get intermittent or no operation.

2) Second use a volt ohm meter to make sure you have voltage on the two brush connectors inside the brush holders when power is on. If you do then open the unit a check continuity on the motor armature to see if it is open, which will cost $13.37. If you do not have voltage, inspect the power cord and switch.

Some parts can be purchased on the below link.

Or contact a dremel service center from the link below.

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The armature bearings fit very snugly in their holders. If you have the case split and the belt drive pully off, you just have to pry the armature out of the other bearing holder. If you are replacing the entire armature and the new one has a fan on it just pry it out. If the new armature doesn't have a fan on it be careful not to break the fan or any of the fins. It should pull out smoothly, if it doesn't come out with even pressure you still have something on the armature holding it in.

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Tool turn on and seems to run, but working end does not turn. I took it apart anf the plastic bushing on the metal shaft is stripped. It also sems like the metal shaft may be worn. Can I buy replacement...

Hi Joe, Joe here. I have a dremel tool now for almost 25 years. Same one. I had this happen to me. You should be able to get the parts at any hardware store that has the big dremel accessories cabinet. You can also get the parts from dremel's customer service. Great tool, next to my leatherman wave.

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How do I attach tools to my Dremel?

hello. You loosen the arbor at the base of the shaft closest to the tool. There is a tiny wrench in the kit that came with the dremel, or you can use a pair of pliers to loosen it. Joe

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